Which of the following is an example of a zoonotic spillover event?

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Question: Which of the following is an example of a zoonotic spillover event?

Option a: Viral transmission from an infected patient to their doctor. This is human-to-human transmission and does not involve a animal reservoir spilling over into humans, so it is not a zoonotic spillover.

Option b: Viral transmission from a domestic pig to a farmer. This describes a pathogen moving from an animal (pig) to a human (farmer), which fits the classic definition of a zoonotic spillover event where a disease originates in animals and spills over to humans.

Option c: Viral transmission from a wild goose to domestic fowl. This is an interspecies transmission among animals (animal-to-animal), not a human infection, so it is not a zoonotic spillover event to humans.

Option d: Viral transmission between two populations of horseshoe bats. While this is a cross-population transmission within the same species of animal, it does not involve transmission to humans, hence it is not a zoonotic spillover event.

In summary, the key idea of a zoonotic spillover is a pathogen crossing the species barrier from animals to humans. Among the choices, only option b describes transmission from an animal source to a human, which characterizes a zoonotic spillover.

MIC2022 S2 2025 MIC2022 - Practice Exam

Which of the following is an example of a zoonotic spillover event?

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